A relaxation treatment method for excavation of multi-layer structure rock mass dam foundation

A multi-layer structure and excavation relaxation technology, which is applied in excavation, infrastructure engineering, construction, etc., can solve the problems of difficulty in controlling the excavation quality of the upper rock mass and low construction efficiency, so as to ensure the quality of excavation and improve the construction quality. Efficiency, damage reduction effect

Active Publication Date: 2021-07-09
CHINA THREE GORGES PROJECTS DEV CO LTD +1
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  • Application Information

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Problems solved by technology

[0005] Aiming at the problems of difficult control of rock mass excavation quality and low construction efficiency in traditional excavation technology, the present invention provides a dam foundation excavation based on structural surface pre-reinforcement, pre-consolidation grouting, diffuse energy blasting and hole bottom initiation. Relaxation technology

Method used

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  • A relaxation treatment method for excavation of multi-layer structure rock mass dam foundation
  • A relaxation treatment method for excavation of multi-layer structure rock mass dam foundation
  • A relaxation treatment method for excavation of multi-layer structure rock mass dam foundation

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Embodiment 1

[0033] see Figure 1-4 A method for treating relaxation of a multi-layer structure rock mass dam foundation excavation comprises the following steps:

[0034] Step1: Excavate to the top surface of the protective layer 2: From top to bottom, excavate in layered steps to the elevation of the top surface of the protective layer 2 of the reserved protective layer 3, where the thickness of the reserved protective layer 3 is 3~5m;

[0035] Step2: Pre-reinforce the structural surface 1: judge the development of the internal structural surface of the dam foundation retained rock mass 9 according to the survey data, judge whether there is a long and large structural surface, and use the anchor rod 11 to retain the dam foundation below the reserved protective layer 3 The rock mass 9 is anchored in advance;

[0036] Step3: Pre-consolidation grouting for the retained rock mass 9 of the dam foundation: after the pre-reinforcement of the bolt 11 is completed, perform pre-consolidation grou...

Embodiment 2

[0047] The excavation of the dam foundation of a water conservancy and hydropower project adopts the above-mentioned relaxation treatment method for the excavation of the multi-layer structure rock mass dam foundation. From top to bottom, there are 4 layers of rock formations, the reserved protective layer 3 is columnar joint basalt, and downwards are distributed successively with breccia lava, columnar joint basalt, and oblique porphyry basalt. According to the technical requirements of dam foundation excavation, a layer of protective layer is reserved for blasting excavation, and the thickness of the protective layer is 5m; the existing structural surface 1 is pre-reinforced, and the bolt is vertical to the structural surface, and the reserved protective layer for blasting is proposed The inside is a hollow hole, and the anchor rod only reinforces the rock mass retained on the foundation surface. After the anchoring is completed, basalt fiber mortar concrete is used for pre-...

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Abstract

The present invention provides the present invention provides a multi-layer structure rock mass dam foundation excavation relaxation treatment method, which is an optimal dam foundation excavation relaxation based on structural surface pre-reinforcement, pre-consolidation grouting, diffuse energy blasting and hole bottom detonation. processing technology. Compared with the traditional layered excavation method of protective layer, this method does not need to use three-layer excavation, which reduces construction interference, improves construction progress, and shortens construction period; at the same time, it effectively controls the excavation of multi-layered rock mass. Digging into slack and damage control puzzles.

Description

technical field [0001] The invention belongs to the technical field of blasting and excavation of complex rock mass, in particular to a method for treating the relaxation of multi-layer structure rock mass dam foundation excavation. Background technique [0002] As an efficient and economical construction technology, engineering blasting is widely used in the construction of water conservancy, mining, and transportation projects, especially in the blasting and excavation of rock masses such as tunnels, slopes, and dam foundations. [0003] During the blasting and excavation of rock mass, due to the effect of blast load, dynamic damage to the retained rock mass will inevitably occur while the rock blasting is completed. At the same time, complex rock mass, especially multi-layer structure rock mass, will also aggravate this effect; pretreatment measures during construction, blasting excavation methods, and charging network parameters will all affect the relaxation and impact ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F42D1/00F42D3/04E02D17/00E02D3/12
Inventor 杨支跃严鹏周孟夏刘晓高世奎高启栋罗贯军刘春风
Owner CHINA THREE GORGES PROJECTS DEV CO LTD
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